A low power microwave room-temperature air plasma jet at atmospheric pressure

An atmospheric pressure low power microwave-induced air plasma source at 2.45 GHz is presented in this Letter. The device was capable of self-igniting air and generating plasma with only 50 W microwave input power and without any extra trigger. Its sustaining power was as low as 10 W, and the gas te...

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Bibliographic Details
Published in:Applied physics letters 2023-07, Vol.123 (3)
Main Authors: Wu, Li, Zhang, Xianyu, Liu, Tao, Zhang, Wencong, Tao, Junwu, Cheng, Fei
Format: Article
Language:English
Subjects:
Air plasma
Applied physics
Atmospheric pressure
Electromagnetism
Engineering Sciences
Fiber optics
Gas temperature
Plasma jets
Portable equipment
Power management
Room temperature
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Summary:An atmospheric pressure low power microwave-induced air plasma source at 2.45 GHz is presented in this Letter. The device was capable of self-igniting air and generating plasma with only 50 W microwave input power and without any extra trigger. Its sustaining power was as low as 10 W, and the gas temperature of plasma tail flame measured by a fiber optic thermometer was about 32 °C. Spectroscopic measurements showed strong O H ( A 2 Σ + → X 2 Π ) bands at 306–310 nm and oxygen atomic lines O I (3p5P → 3s5S) at 777.1 nm and O I (3p3P → 3s3S) at 844.6 nm. N O − γ ( A 2 Σ + → X 2 Π r ) from 200 to 300 nm was also detected in this air plasma jet. This portable plasma apparatus offers potential for air plasma applications in the biomedical fields.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0152898